Indented paper manufacture



Mal ch '28, 1950 c. R. WALKE R INDENTED PAPER MANUFACTURE Filed Dec. 5.,1945 I V EN TOR. C M4131. ES M1; (E45 ATTORNEYS.

Patented Mar. 28, 1950 INDENTED PAPER MANUFACTURE Charles R. Walker,Cincinnati, Ohio, assignor to The Fox Paper Company, Cincinnati, Ohio, a

corporation of Ohio Application December 5, 1945, Serial No. 532,823

The present invention relates to the practice of ,making non-nestingindented paper strips. In the manufacture of indented paper a sheet ofpaper board or heavy paper is passed between a pair of rolls which havepatterned surfaces which interengage to form a large number ofrelatively small projections and indentations on the sheet. In onepractice, paper webs formed and dried are moistened with a steam from ajet applied to the webs shortly before passing between the rolls, andthe rolls heated to set the indentation.

It is important, where padding is being formed from two or more piecesof indented paper that the pattern of indentations do not mesh with eachother, as if this takes place the cushioning effect of the indentationsis substantially lost. I have found it desirable to avoid so far aspossible the practice, in making up padding from a series of webs ofindented paper, of rolling the paper webs onto rolls after beingindented and then unreeling the paper for the purpose of combinlng itwith other webs in making the padding. This is because the making of aneat roll from paper web requires fairly tight coiling and this resultsin crushing down the indentations, particularly as freshly indented.

A peculiarity which has been noted in the practice of forming indentedpaper, particularly with patterns which have sharply angled walls of theindentations, is that to obtain a sharp and high indentation on a singlesheet of the normal type of paper used in making padding, the indentingrolls must be brought so close together that they tend to rip and tearthe paper. This is due in part to the fact that in indenting of paperthe material in many patterns of indentation must flow in order to formup, as distinguished from pure corrugation of paper in which thematerial forming the bends is mainly accumulated from the length of theweb being corrugated, thus shortening the over-all length of thecorrugated web as compared to the original material.

1 When, however, more than one web of paper is passed through indentingrolls at the same time, the indentation pattern forming projections onthe rolls do not tend to tear and split the paper probably because theadjustment of the rolls together is not so close and because the severalwebs protect each other after the 8 Claims. (Cl. l54-33.05)

' fashion of a cushion. A difficulty with forming several indented websin a passage through the same set of indenting rolls is that the patternis the same and hence the indented webs will mesh, and not form a fullycushioned pad directly from the indenter.

It is an object of the present invention to form multiple thicknesspadding of indented paper by a practice in which all webs are indentedby a passage together through a single set of indenting rolls, and inwhich certain of the webs are further treated continuously to avoidnesting. In this way the reeling of an already indented web is notrequired, and among other things the webs can be furnished continuouslyto a wrapping machine which wraps the set of webs into a continuous padwhich can be cut into lengths as desired. Where more than two layers areto be combined in a pad only alternate webs will normally be treated toavoid nesting. I will describe the invention by referring to the makingof a three thickness pad since this will explain methods of productionsand structures which inelude various thicknesses.

I have illustrated partially diagrammatically in the drawings, anarrangement of apparatus which will accomplish the ends noted.

In the drawings:

Figure 1 is a partially diagrammatic side elevation of a mechanicalarrangement for carrying out my practice.

Figure 2 is a plan view of the central web in several stages oftreatment.

- Figure 3 is a large view of a portion of the central web as completedbefore combining with the two outer webs to form a pad.

The illustrated practice is supplied with three rolls of paper I, 2 and3, suitable for indenting. The webs are drawn past steam jets 4, andinto the indenting machine 5. This machine is equipped with a pair ofdriven indenting rolls 6, 6, which engage all three webs of the paper atthe same time, thus indenting them.

There is also provided a stand of driven rolls 1 through which thecentral web (still marked 2) is caused to pass. These rolls are providedwith alternate teeth 8 and pockets 9 which mesh with each other and areso conformed as to cut V-shaped, or they may be U or other shapedpatterns ill, in the web and push the liberated tongues II and [2, outof the plane of the web. The shape of the tongues is not essential andis subject to choice or convenience. There may be a set of tongues II,in the web followed by a set of tongues l2, and. since the rolls are socut, the tongues II will project somewhat from the top surface of theweb and the tongues i2 will project slightly from the bottom surface ofthe web. Also, by a suitable cutting of the tongue forming rollsalternate tongues in the transverse rows may be so struck as to projectalternately at the top and bottom of the webs. Other patterns may, ofcourse, be used;

The web then passes between a pair of blades l3, It, in another standl5, which blades engage the projecting tongues at each side of the weband fold them back against the web. This folding back need only besufficient for the angles of the tongues to be lagging with respect tothe direction of feed of the web, and the particular top and bottomprojection of the tongues will regulate which ones are laid. back on thetop and which are laid back on the bottom of this central sheet.

The two outer webs (still marked l and 3) are guided by means ofsuitable guide rolls so as to pass through the stand 1 above and belowthe rolls I and above and below the fold back blades I3, M.

The three webs meet between rolls I6 and I1, and at Il may be met withasheet' of wrapping paper l8, which is supplied with adhesive streams bythe appliance l9. Rolls l6 and I1 will be guide rolls, normally, ratherthan feed rolls.

In the drawings the wrapping machine has not been shown except for thefeed rolls 20' which draw the assembled wrapped webs through thewrapping apparatus and incidentally draw the three Webs forming thefilling of the pad from the driven rolls 6 and l.

The tongues on both sides of the central web will fold entirely back andform sufiicient layer to keep the otherwise nestable sheets from nestingtogether, as the assembly of layers is completed.

Instead of drawing the webs along from the feed rolls of a wrappingmachine, a cementing machine could be used in which case silicate orsome other adhesive would be imposed on the several webs and theoperation will'be to' cement them together with a view to formingunwrapped pads, packing partition pieces, etc. At any rate the feedrolls engage the assembled webs which mitigates crushing of the freshindentations in whatever device is used to form assemblies of the threewebs. There may be additional webs on the outside of. the three webassembly, or other sandwiches of non-nesting type secured together withthe three layer assembly, which may be wrapped or unwrapped, adhesivelyjoined or stapled or taped together, or simply left as unsecuredassemblies. Where five webs are indented together then the second andfourth webs may be formed with the tongues. Where but two webs are used,which is not preferred the tongues to prevent nesting will best be cutin one of the webs only, the tongue cutting roll being arranged todeflect the tongues alike and a single blade I3 will turn all tonguesback so as to lie on the surface of the web which meets the other web.In the three web form such a treatment could be given to the two outerwebs in which case the tongues would lie on the inner faces of the twoouterwebs.

I have been able to indent up to six webs at a time in a pair ofindenting rolls. The difliculty lies on separating the webs afterindenting. The tongue treatment can be adapted in various ways as willbe evident without further comment.

Having thus described the invention, what is claimed as new and isdesired to be covered by Letters Patent is:

1. The method of forming an indented paper pad including at least threeplies, which comprises supplying three continuous webs of paper, passingsaid webs together between a pair of driven indenting rolls, separatingthe two outer webs and passing the central web through a device forpunching out and laying back tongues on both sides of the said centralweb, causing the separated webs to pass under and over the said device,and then bringing the webs together to form a three ply padding wherebythe tongues act as spacers to prevent nesting.

2. The method of forming an indented paper pad having at least threeplies, which comprises supplying three continuous webs of paper, passingsaid webs together between a pair of driven indenting rolls, separatingthe two outer webs and passing the central web through a device forpunching out and laying back tongues on both sides of the said centralweb, causing the separated webs to pass under and over the said device,and then bringing the webs together to form a three ply padding, wherebythe tongues act as spacers to prevent nesting; and, after the webs areassembled, feeding them along with drive rolls.

3. The method according to claim 1 in which the tongues are in rows indirections across and lengthwise of the said central web, and whichincludes the steps of alternately laying back tongues on opposite facesof the said central web in the rows extending in one of the nameddirections, at least.

4. The method of forming an indented paper pad with at least threeplies, which comprises supplying three webs of paper, causing the websto pass together through a pair of driven indenting rolls, separatingthe two outer webs, acting on the central web to first punch out andthen lay back on the faces of the web a series of tongues alternating onboth faces of the web, then bringing the webs together whereby nestingwill be prevented by means of the tongues, feeding the outer websfollowin indenting, and the central web following punching out thetongues, by means of feed applied to the assembled webs.

5. That method of forming a non-nesting pad of indented paper whichconsists in passing a plurality of webs of indentable paper togetherbetween a pair of indenting rolls, separating the webs continuously, andcontinuously passing at least one of the webs through the step ofcutting tongues therein laying them backwardly of the path of travel ofthe web, said tongues lying on the crests of the indentations andforming a supporting element preventing nesting of the indentations.

6. The method of claim 5 in which the webs are two in number, and thetongues are laid back on one side of .the selected web. I

'7. The method of claim 5 in which the webs are more than two and thetongues are laid back on sides which will be in contact with the meetingfaces of webs not having tongues to act as spacers when said webs areassembled into pad form.

8. The method of claim 5 in which the feed for drawing the webs from theindenting rolls and 15 through the tongue forming and folding instrug 6mentalities is applied to the webs when re-as- Number Name Date sembledtogether into pad form. 1,796,541 Schoo Mar. 17, 1931 CHARLES R. WALKER.1,927,791 13 11;: Sept. 19, 1933 1,943,145 R1' 1egenberg Jan. 9, 1934REFERENCES CITED 5 1,971,780 'Gzjaham et a1. Aug. 23, 1934 1,939,794 Dujan 'Feb. 5, 1935 2 memes are record 2,036,051 K1 1 11111 Mar. 31, 19362,106,246 Fourness Jan. 25, 1938 UNITED STATES PATENTS 2,110,732 wjeberMar. 8, 193a Number Name a FOREIGN PATENTS 201,929 Macdonald Apr. 2,1373 493,929 Holcomb Mar. 21, 1393 Number Country Date 1,542,427 WardenJune 16, 1925 85,613 Germany 21, 1896

